Equipment Acquisitions, Dispositions and Depreciation and Impairment Policies (Tables)

6 Months Ended

Jun. 30, 2013

Equipment Acquisitions, Dispositions And Depreciation And Impairment Policies [Abstract]

Schedule Of Deferred Gain Activity [Table Text Block]

Deferred gain activity related to these transactions for the six months ended June 30 was as follows (in thousands):

	2013			2012
Balance at beginning of period	$	111,514		$	117,192
Deferred gains arising from asset sales	2,289			7,280
Amortization of deferred gains included in operating expenses as a reduction to rental expense	(5,192		)	(9,526		)
Amortization of deferred gains included in gains on asset dispositions and impairments, net	(1,431		)	(2,039		)
Balance at end of period	$	107,180		$	112,907

Schedule of Estimated Useful Life of Newly Acquired Equipment [Table Text Block]

As of June 30, 2013, the estimated useful life (in years) of each of the Company’s major categories of new equipment was as follows:

Offshore support vessels (excluding wind farm utility)	20
Wind farm utility vessels	10
Inland river dry cargo and deck barges	20
Inland river liquid tank barges	25
Inland river towboats	25
U.S.-flag product tankers	25
RORO(1) vessels	20
Harbor tugs	25
Ocean liquid tank barges	25
Terminal and manufacturing facilities	20

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(1) Roll on/Roll off ("RORO").